How to replace Uebimiau with Squirrelmail
For those who whish to abandon the /webmail link Uebimiau and replace it with squirrelmail, you can accomplish that by doing the following.
Edit your /etc/httpd/conf/httpd.conf (/etc/httpd/conf/extra/httpd-alias.conf if you're using custombuild)
Change the code
Alias /webmail /var/www/html/webmail/
to the code
Alias /webmail /var/www/html/squirrelmail/
Then restart apache. This will make all accesses of /webmail point to squirrelmail.